| 摘要 |
a coating liquid is obtained by dissolving a polymerizable liquid crystal compound, a polymerization initiator and a chiral agent, and additionally if necessary, a surface active agent, an alignment control agent and the like in a solvent; the coating liquid is applied onto an isotropic transparent film in a film form and dried thereon; and then the dried film is subjected to polymerization. In this optical device, the lower limit UL of the range reflecting light at an incident angle of 0 degree is longer than the wavelength UR1 of the light exhibiting the maximum emission intensity in a wavelength range of 600-700 nm among the light emitted from the light source, and the average transmittance to light having a wavelength of 600-700 nm at the incident angle of 60 degrees is not less than 40% but not more than 90%.
|
